Articles or book(s) about the functions behind a scientific calculator
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11-23-2018, 06:00 PM
(This post was last modified: 11-23-2018 09:11 PM by SlideRule.)
Post: #25
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RE: Articles or book(s) about the functions behind a scientific calculator
Chapter 7 The CORDIC Algorithm (pgs 133-156) of Elementary Functions algorithms & implementation 2e by Jean-Michel Muller {© 2006 Birkhäuser} may also be of interest.
excerpt from Chapter 1 This book is devoted to the computation of the elementary functions. Here, we call elementary functions the most commonly used mathematical functions: sin, cos, tan, sin⁻¹, cos⁻¹, tan⁻¹, sinh, cosh, tanh, sinh⁻¹, cosh⁻¹, tanh⁻¹, exponentials, and logarithms (we should merely say “elementary transcendental functions”: from a mathematical point of view, ¹/x is an elementary function as well as e^x. We do not deal with the basic arithmetic functions in this book). Theoretically, the elementary functions are not much harder to compute than quotients: it was shown by Alt [4] that these functions are equivalent to division with respect to Boolean circuit depth. This means that, roughly speaking, a circuit can output n digits of a sine, cosine, or logarithm in a time proportional to log n (see also Okabe et al. [249], and Beame et al. [25]). For practical implementations, however, it is quite different, and much care is necessary if we want fast and accurate elementary functions. BEST! SlideRule |
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